/*******************************************************************************
 * Copyright (c) 2002, 2011 Rational Software Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 * IBM Rational Software - Initial API and implementation
 * Intel corp - rework for New Project Model
 *******************************************************************************/
package org.eclipse.cdt.ui.wizards;

import java.lang.reflect.InvocationTargetException;
import java.net.URI;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.eclipse.cdt.core.CCorePlugin;
import org.eclipse.cdt.core.model.CoreModel;
import org.eclipse.cdt.core.model.ILanguage;
import org.eclipse.cdt.core.model.LanguageManager;
import org.eclipse.cdt.core.settings.model.ICProjectDescription;
import org.eclipse.cdt.core.settings.model.ICProjectDescriptionManager;
import org.eclipse.cdt.internal.ui.newui.Messages;
import org.eclipse.cdt.internal.ui.wizards.ICDTCommonProjectWizard;
import org.eclipse.cdt.ui.CUIPlugin;
import org.eclipse.core.filesystem.EFS;
import org.eclipse.core.filesystem.IFileInfo;
import org.eclipse.core.filesystem.IFileStore;
import org.eclipse.core.resources.IProject;
import org.eclipse.core.resources.IProjectDescription;
import org.eclipse.core.resources.IResource;
import org.eclipse.core.resources.IWorkspace;
import org.eclipse.core.resources.IWorkspaceRoot;
import org.eclipse.core.resources.IWorkspaceRunnable;
import org.eclipse.core.resources.ResourcesPlugin;
import org.eclipse.core.runtime.CoreException;
import org.eclipse.core.runtime.IConfigurationElement;
import org.eclipse.core.runtime.IExecutableExtension;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.NullProgressMonitor;
import org.eclipse.core.runtime.Platform;
import org.eclipse.core.runtime.SubMonitor;
import org.eclipse.core.runtime.content.IContentType;
import org.eclipse.core.runtime.content.IContentTypeManager;
import org.eclipse.jface.dialogs.MessageDialog;
import org.eclipse.jface.operation.IRunnableWithProgress;
import org.eclipse.ui.actions.WorkspaceModifyDelegatingOperation;
import org.eclipse.ui.wizards.newresource.BasicNewProjectResourceWizard;
import org.eclipse.ui.wizards.newresource.BasicNewResourceWizard;

public abstract class CDTCommonProjectWizard extends BasicNewResourceWizard
		implements IExecutableExtension, IWizardWithMemory, ICDTCommonProjectWizard {
	private static final String PREFIX = "CProjectWizard"; //$NON-NLS-1$
	private static final String OP_ERROR = "CProjectWizard.op_error"; //$NON-NLS-1$
	private static final String title = CUIPlugin.getResourceString(OP_ERROR + ".title"); //$NON-NLS-1$
	private static final String message = CUIPlugin.getResourceString(OP_ERROR + ".message"); //$NON-NLS-1$
	private static final String[] EMPTY_ARR = new String[0];

	protected IConfigurationElement fConfigElement;
	protected CDTMainWizardPage fMainPage;

	protected IProject newProject;
	private String wz_title;
	private String wz_desc;

	private boolean existingPath = false;
	private String lastProjectName = null;
	private URI lastProjectLocation = null;
	private CWizardHandler savedHandler = null;

	public CDTCommonProjectWizard() {
		this(Messages.NewModelProjectWizard_0, Messages.NewModelProjectWizard_1);
	}

	public CDTCommonProjectWizard(String title, String desc) {
		super();
		setDialogSettings(CUIPlugin.getDefault().getDialogSettings());
		setNeedsProgressMonitor(true);
		setForcePreviousAndNextButtons(true);
		setWindowTitle(title);
		wz_title = title;
		wz_desc = desc;
	}

	@Override
	public void addPages() {
		fMainPage = new CDTMainWizardPage(CUIPlugin.getResourceString(PREFIX));
		fMainPage.setTitle(wz_title);
		fMainPage.setDescription(wz_desc);
		addPage(fMainPage);
	}

	/**
	 * @return true if user has changed settings since project creation
	 */
	private boolean isChanged() {
		if (savedHandler != fMainPage.h_selected)
			return true;

		if (!fMainPage.getProjectName().equals(lastProjectName))
			return true;

		URI projectLocation = fMainPage.getProjectLocation();
		if (projectLocation == null) {
			if (lastProjectLocation != null)
				return true;
		} else if (!projectLocation.equals(lastProjectLocation))
			return true;

		return savedHandler.isChanged();
	}

	@Override
	public IProject getProject(boolean defaults) {
		return getProject(defaults, true);
	}

	@Override
	public IProject getProject(boolean defaults, boolean onFinish) {
		if (newProject != null && isChanged())
			clearProject();
		if (newProject == null) {
			existingPath = false;
			try {
				IFileStore fs;
				URI p = fMainPage.getProjectLocation();
				if (p == null) {
					fs = EFS.getStore(ResourcesPlugin.getWorkspace().getRoot().getLocationURI());
					fs = fs.getChild(fMainPage.getProjectName());
				} else
					fs = EFS.getStore(p);
				IFileInfo f = fs.fetchInfo();
				if (f.exists() && f.isDirectory()) {
					if (fs.getChild(".project").fetchInfo().exists()) { //$NON-NLS-1$
						if (!MessageDialog.openConfirm(getShell(), Messages.CDTCommonProjectWizard_0,
								Messages.CDTCommonProjectWizard_1))
							return null;
					}
					existingPath = true;
				}
			} catch (CoreException e) {
				CUIPlugin.log(e.getStatus());
			}
			savedHandler = fMainPage.h_selected;
			savedHandler.saveState();
			lastProjectName = fMainPage.getProjectName();
			lastProjectLocation = fMainPage.getProjectLocation();
			// start creation process
			invokeRunnable(getRunnable(defaults, onFinish));
		}
		return newProject;
	}

	/**
	 * Remove created project either after error
	 * or if user returned back from config page.
	 */
	private void clearProject() {
		if (lastProjectName == null)
			return;
		try {
			ResourcesPlugin.getWorkspace().getRoot().getProject(lastProjectName).delete(!existingPath, true, null);
		} catch (CoreException ignore) {
		}
		newProject = null;
		lastProjectName = null;
		lastProjectLocation = null;
	}

	private boolean invokeRunnable(IRunnableWithProgress runnable) {
		IRunnableWithProgress op = new WorkspaceModifyDelegatingOperation(runnable);
		try {
			getContainer().run(true, true, op);
		} catch (InvocationTargetException e) {
			CUIPlugin.errorDialog(getShell(), title, message, e.getTargetException(), true);
			clearProject();
			return false;
		} catch (InterruptedException e) {
			clearProject();
			return false;
		}
		return true;
	}

	@Override
	public boolean performFinish() {
		boolean needsPost = (newProject != null && !isChanged());
		// create project if it is not created yet
		if (getProject(fMainPage.isCurrent(), true) == null)
			return false;
		fMainPage.h_selected.postProcess(newProject, needsPost);
		try {
			setCreated();
		} catch (CoreException e) {
			e.printStackTrace();
			return false;
		}
		BasicNewProjectResourceWizard.updatePerspective(fConfigElement);
		selectAndReveal(newProject);
		return true;
	}

	protected boolean setCreated() throws CoreException {
		ICProjectDescriptionManager mngr = CoreModel.getDefault().getProjectDescriptionManager();

		ICProjectDescription des = mngr.getProjectDescription(newProject, false);

		if (des == null) {
			return false;
		}

		if (des.isCdtProjectCreating()) {
			des = mngr.getProjectDescription(newProject, true);
			des.setCdtProjectCreated();
			mngr.setProjectDescription(newProject, des, false, null);
			return true;
		}
		return false;
	}

	@Override
	public boolean performCancel() {
		clearProject();
		return true;
	}

	@Override
	public void setInitializationData(IConfigurationElement config, String propertyName, Object data)
			throws CoreException {
		fConfigElement = config;
	}

	private IRunnableWithProgress getRunnable(boolean _defaults, final boolean onFinish) {
		final boolean defaults = _defaults;
		return imonitor -> {
			final Exception except[] = new Exception[1];
			getShell().getDisplay().syncExec(() -> {
				IRunnableWithProgress op = new WorkspaceModifyDelegatingOperation(monitor -> {

					SubMonitor subMonitor = SubMonitor.convert(monitor,
							CUIPlugin.getResourceString("CProjectWizard.op_description"), 100);//$NON-NLS-1$
					subMonitor.worked(10);
					try {
						newProject = createIProject(lastProjectName, lastProjectLocation, subMonitor.split(40));
						if (newProject != null) {
							fMainPage.h_selected.createProject(newProject, defaults, onFinish, subMonitor.split(40));
						}
						subMonitor.worked(10);
					} catch (CoreException e) {
						CUIPlugin.errorDialog(getShell(), title, message, e, true);
					}
				});
				try {
					getContainer().run(false, true, op);
				} catch (InvocationTargetException e1) {
					except[0] = e1;
				} catch (InterruptedException e2) {
					except[0] = e2;
				}
			});
			if (except[0] != null) {
				if (except[0] instanceof InvocationTargetException) {
					throw (InvocationTargetException) except[0];
				}
				if (except[0] instanceof InterruptedException) {
					throw (InterruptedException) except[0];
				}
				throw new InvocationTargetException(except[0]);
			}
		};
	}

	@Override
	public IProject createIProject(final String name, final URI location) throws CoreException {
		return createIProject(name, location, new NullProgressMonitor());
	}

	/**
	 * @since 5.1
	 */
	protected IProgressMonitor continueCreationMonitor;

	/**
	 * @param monitor
	 * @since 5.1
	 *
	 */
	@Override
	public IProject createIProject(final String name, final URI location, IProgressMonitor monitor)
			throws CoreException {
		SubMonitor subMonitor = SubMonitor.convert(monitor, Messages.CDTCommonProjectWizard_creatingProject, 100);
		if (newProject != null)
			return newProject;

		IWorkspace workspace = ResourcesPlugin.getWorkspace();
		IWorkspaceRoot root = workspace.getRoot();
		final IProject newProjectHandle = root.getProject(name);

		if (!newProjectHandle.exists()) {
			//			IWorkspaceDescription workspaceDesc = workspace.getDescription();
			//			workspaceDesc.setAutoBuilding(false);
			//			workspace.setDescription(workspaceDesc);
			IProjectDescription description = workspace.newProjectDescription(newProjectHandle.getName());
			if (location != null) {
				description.setLocationURI(location);
			}
			newProject = CCorePlugin.getDefault().createCDTProject(description, newProjectHandle, subMonitor.split(50));
		} else {
			IWorkspaceRunnable runnable = monitor1 -> newProjectHandle.refreshLocal(IResource.DEPTH_INFINITE, monitor1);
			workspace.run(runnable, root, IWorkspace.AVOID_UPDATE, subMonitor.split(50));
			newProject = newProjectHandle;
		}

		// Open the project if we have to
		if (!newProject.isOpen()) {
			newProject.open(subMonitor.split(25));
		}
		continueCreationMonitor = subMonitor.split(25);
		return continueCreation(newProject);
	}

	protected abstract IProject continueCreation(IProject prj);

	@Override
	public abstract String[] getNatures();

	@Override
	public void dispose() {
		fMainPage.dispose();
	}

	@Override
	public boolean canFinish() {
		if (fMainPage.h_selected != null) {
			if (!fMainPage.h_selected.canFinish())
				return false;
			String s = fMainPage.h_selected.getErrorMessage();
			if (s != null)
				return false;
		}
		return super.canFinish();
	}

	/**
	 * Returns last project name used for creation
	 */
	@Override
	public String getLastProjectName() {
		return lastProjectName;
	}

	@Override
	public URI getLastProjectLocation() {
		return lastProjectLocation;
	}

	@Override
	public IProject getLastProject() {
		return newProject;
	}

	// Methods below should provide data for language check
	@Override
	public String[] getLanguageIDs() {
		String[] contentTypeIds = getContentTypeIDs();
		if (contentTypeIds.length > 0) {
			IContentTypeManager manager = Platform.getContentTypeManager();
			List<String> languageIDs = new ArrayList<>();
			for (int i = 0; i < contentTypeIds.length; ++i) {
				IContentType contentType = manager.getContentType(contentTypeIds[i]);
				if (null != contentType) {
					ILanguage language = LanguageManager.getInstance().getLanguage(contentType);
					if (!languageIDs.contains(language.getId())) {
						languageIDs.add(language.getId());
					}
				}
			}
			return languageIDs.toArray(new String[languageIDs.size()]);
		}
		return EMPTY_ARR;
	}

	@Override
	public String[] getContentTypeIDs() {
		return EMPTY_ARR;
	}

	@Override
	public String[] getExtensions() {
		String[] contentTypeIds = getContentTypeIDs();
		if (contentTypeIds.length > 0) {
			IContentTypeManager manager = Platform.getContentTypeManager();
			List<String> extensions = new ArrayList<>();
			for (int i = 0; i < contentTypeIds.length; ++i) {
				IContentType contentType = manager.getContentType(contentTypeIds[i]);
				if (null != contentType) {
					String[] thisTypeExtensions = contentType.getFileSpecs(IContentType.FILE_EXTENSION_SPEC);
					extensions.addAll(Arrays.asList(thisTypeExtensions));
				}
			}
			return extensions.toArray(new String[extensions.size()]);
		}
		return EMPTY_ARR;
	}

}
